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Fair Value Measurements (Changes in Fair Value of Securities Using Level 3 Inputs) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Obligations of States and Political Subdivisions [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, December 31 $ 6,661 $ 7,745
Total net gains (losses) for the period included in OCI (7) (581)
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements 0 0
Transfers into Level 3 0 0
Transfers out of Level 3 0 0
Fair value, June 30 6,716 7,008
Change in unrealized gains (losses) for the period included in earnings for assets held at period end 62 (156)
Change in unrealized gains (losses) for the period included in OCI for assets held at period end (7) (581)
Corporate Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, December 31 187,980 114,127
Total net gains (losses) for the period included in OCI 1,857 (16,422)
Purchases 58,586 55,343
Sales 0 0
Issuances 0 0
Settlements (5,535) (3,903)
Transfers into Level 3 2,238 19,214
Transfers out of Level 3 0 (7,037)
Fair value, June 30 245,489 159,289
Change in unrealized gains (losses) for the period included in earnings for assets held at period end 251 (2,047)
Change in unrealized gains (losses) for the period included in OCI for assets held at period end 1,846 (16,424)
Collateralized Loan Obligations and Other Asset Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, December 31 153,342 124,909
Total net gains (losses) for the period included in OCI (1,168) (8,592)
Purchases 39,713 39,133
Sales 0 0
Issuances 0 0
Settlements (3,153) (6,479)
Transfers into Level 3 14,148 0
Transfers out of Level 3 (953) (24,646)
Fair value, June 30 201,926 123,616
Change in unrealized gains (losses) for the period included in earnings for assets held at period end 17 (777)
Change in unrealized gains (losses) for the period included in OCI for assets held at period end (1,168) (8,551)
Residential Mortgage Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, December 31   245
Total net gains (losses) for the period included in OCI   (17)
Purchases   0
Sales   0
Issuances   0
Settlements   (11)
Transfers into Level 3   0
Transfers out of Level 3   (217)
Fair value, June 30   0
Change in unrealized gains (losses) for the period included in earnings for assets held at period end   0
Change in unrealized gains (losses) for the period included in OCI for assets held at period end   (17)
Commercial Mortgage Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, December 31 375 4,256
Total net gains (losses) for the period included in OCI 64 (446)
Purchases 0 0
Sales 0 0
Issuances 0 0
Settlements (21) (12)
Transfers into Level 3 2,848 0
Transfers out of Level 3 (2,626) (3,431)
Fair value, June 30 377 407
Change in unrealized gains (losses) for the period included in earnings for assets held at period end 0 (7)
Change in unrealized gains (losses) for the period included in OCI for assets held at period end 64 (446)
Common Stock [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, December 31 897  
Total net gains (losses) for the period included in OCI 0  
Purchases 0  
Sales 0  
Issuances 0  
Settlements 0  
Transfers into Level 3 0  
Transfers out of Level 3 0  
Fair value, June 30 662  
Change in unrealized gains (losses) for the period included in earnings for assets held at period end (235)  
Change in unrealized gains (losses) for the period included in OCI for assets held at period end 0  
Investments [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value, December 31 349,255 251,282
Total net gains (losses) for the period included in OCI 746 (26,058)
Purchases 98,299 94,476
Sales 0 0
Issuances 0 0
Settlements (8,709) (10,405)
Transfers into Level 3 19,234 19,214
Transfers out of Level 3 (3,579) (35,331)
Fair value, June 30 455,170 290,320
Change in unrealized gains (losses) for the period included in earnings for assets held at period end 95 (2,987)
Change in unrealized gains (losses) for the period included in OCI for assets held at period end 735 (26,019)
Gain (Loss) on Investments [Member] | Obligations of States and Political Subdivisions [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net gains (losses) for the period included in net income 62 (156)
Gain (Loss) on Investments [Member] | Corporate Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net gains (losses) for the period included in net income 251 (2,047)
Gain (Loss) on Investments [Member] | Collateralized Loan Obligations and Other Asset Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net gains (losses) for the period included in net income 17 (777)
Gain (Loss) on Investments [Member] | Residential Mortgage Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net gains (losses) for the period included in net income   0
Gain (Loss) on Investments [Member] | Commercial Mortgage Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net gains (losses) for the period included in net income 0 (7)
Gain (Loss) on Investments [Member] | Common Stock [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net gains (losses) for the period included in net income (235)  
Gain (Loss) on Investments [Member] | Investments [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net gains (losses) for the period included in net income 95 (2,987)
Net Investment Income Earned [Member] | Obligations of States and Political Subdivisions [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net gains (losses) for the period included in net income 0 0
Net Investment Income Earned [Member] | Corporate Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net gains (losses) for the period included in net income 112 14
Net Investment Income Earned [Member] | Collateralized Loan Obligations and Other Asset Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net gains (losses) for the period included in net income (20) 68
Net Investment Income Earned [Member] | Residential Mortgage Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net gains (losses) for the period included in net income   0
Net Investment Income Earned [Member] | Commercial Mortgage Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net gains (losses) for the period included in net income (263) 47
Net Investment Income Earned [Member] | Common Stock [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net gains (losses) for the period included in net income 0  
Net Investment Income Earned [Member] | Investments [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total net gains (losses) for the period included in net income $ (171) $ 129